JPH11167841A - Push-on switch - Google Patents

Abstract

(57) [Problem] To provide a push-on switch having a plurality of circuits, which has a simple structure, has few components, and is inexpensive. SOLUTION: A movable contact body 14 in which two movable contacts 15 and 16 are formed by a thin conductive layer on a flexible insulating substrate is composed of two outer fixed contacts 12A and 13A and two inner fixed contacts 12B and 13B lower than the fixed contacts. In the switch case 11 exposed as a set of pairs, each fixing portion 15A, 16A
On the outer fixed contacts 12A and 13A,
5B and 16B are arranged above the inner fixed contacts 12B and 13B, and the fixed portions 15A and 16A are pressed down by the outer peripheral portion 17A of a dome-shaped spring body 17 made of an elastic insulating material. By pressing the pressing projection 17D to perform a switch operation, an inexpensive multiple-circuit push-on switch with a simple configuration can be realized.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention mainly relates to telephones,
The present invention relates to a push-on switch having a plurality of independent circuits used for input buttons of various electronic devices such as a fax machine.

[0002]

2. Description of the Related Art As a conventional push-on switch of this type, there is known a push-on switch described in Japanese Utility Model Application Laid-Open No. Sho.

As shown in a front sectional view of FIG. 15 and an exploded perspective view of FIG. 16, a schematic configuration of the push button 3 held by a cover plate 2 on an upper portion of a case 1 made of insulating resin and having an open top surface is provided. A dome-shaped leaf spring 5, a flexible insulating substrate 6, and a first affixed to the lower surface thereof are provided between two sets of fixed contacts 4A, 4B and 4C, 4D having a difference in height provided on the bottom 1A of the case 1. , The second movable contacts 7A and 7B are arranged in order from the push button 3 side, and the push button 3 is pressed and displaced toward the bottom 1A side, and the
Is deformed toward the bottom 1A, whereby the insulating projection 6 is elastically deformed toward the bottom 1A by the pressing projections 5A and 5B on the lower surface of the leaf spring 5, and the first and second movable contacts 7A on the lower surface of the insulating substrate 6 are deformed. , 7B at approximately the same time as the two sets of fixed contacts 4A, 4B.
B, 4C, and 4D were brought into contact with each other.

[0004]

However, in the above-mentioned conventional push-on switch, it is necessary to attach two movable contacts to the lower surface of a flexible insulating substrate with a complicated contact portion and a large number of components. For example, there is a problem that the cost is high due to the large number of assembly steps, and the switch has a large outer diameter.

SUMMARY OF THE INVENTION The present invention solves the above-mentioned conventional problems, and is a push-on switch having a plurality of circuits which are inexpensive because of a simple structure, have few components, and do not require assembling man-hours, and have a small outer diameter. The purpose is to provide.

[0006]

In order to solve the above-mentioned problems, a push-on switch according to the present invention comprises a plurality of sets of outer fixed contacts and an inner fixed contact which is lower by a predetermined dimension than the set and is inserted into an inner bottom surface. In the molded switch case, a plurality of movable contacts including a fixed portion to be placed on each outer fixed contact and a movable portion extending above each inner fixed contact were formed on the lower surface of the flexible insulating substrate by a thin conductive layer. By placing the movable contact body, pressing a plurality of fixed portions of the movable contact body around the outer periphery of the dome-shaped spring body made of an elastic insulating material, and pressing the pressing projection on the upper surface of the center top of the spring body. The lower surface pushes a plurality of movable parts to perform a switch operation.

Thus, it is possible to realize a push-on switch having a simple structure, a small number of components and a small number of assembling man-hours, a low cost, and a plurality of circuits having small outer diameters.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The invention according to claim 1 of the present invention is an insert molding method in which a plurality of sets of outer fixed contacts and inner fixed contacts lower than this by a predetermined dimension are paired and exposed on the inner bottom surface. A switch case made of an insulating resin whose connection terminals electrically connected to the respective fixed contacts are led out to the outside, and a plurality of sets of the fixed portions placed on the respective outer fixed contacts and the inner fixed contacts thereof A movable contact body formed by a thin conductive layer on the lower surface of a flexible insulating substrate, and a thick outer peripheral lower surface on a plurality of fixed portions of the movable contact body. Elastic insulation in which the lower surface of the thick central top portion connected by the thin conical portion is placed above the plurality of movable portions of the movable contact body, and the upper portion of the central top portion is a pressing projection A dome-shaped spring body made of material Together to close the opening of Tchikesu, the outer peripheral lower surface is fixed to the outer peripheral upper portion of the switch case so as pressing the outer peripheral portion upper surface of the spring body of the dome-shaped,
A push-on switch consisting of a lid plate with a hole through which the pressing projection at the top of the center of the dome-shaped spring body can move up and down in the center.It has a simple structure with few components and a small number of assembly steps. Since it is not necessary, the push-on switch having a plurality of circuits which are inexpensive and have small external dimensions can be realized.

According to a second aspect of the present invention, in the first aspect of the present invention, the thin conductive layer forming the movable contact of the movable contact body made of a flexible insulating substrate is formed by printing a conductive paint. That is, in addition to the same operation as the first aspect of the present invention, there is an operation that a large number of push-on switches for a small current can be provided at a simple process at low cost.

According to a third aspect of the present invention, in the first aspect of the present invention, the thin conductive layer forming the movable contact of the movable contact body made of a flexible insulating substrate is etched after bonding a metal foil. It was formed by
In addition to the same operation as the first aspect, the second aspect
Although it is more expensive than the push-on switch according to the invention described in (1), the push-on switch has an effect of being able to provide a push-on switch that can cope with a large current.

According to a fourth aspect of the present invention, in the first aspect of the invention, the movable contact body is formed by forming a plurality of movable contacts by printing a conductive paint on an insulating film formed on an elastic metal sheet. In addition to the same operation as the first aspect of the present invention, since the movable contact body is formed by forming an insulating film on an elastic metal plate as a substrate, the operating life of the switch is determined by the elasticity of the thin metal plate. Has the effect of greatly improving.

According to a fifth aspect of the present invention, in the invention according to any one of the first to fourth aspects, the movable contact body has a horseshoe-shaped notch so as to surround the movable contact centering above the inner fixed contact. The movable contact of the movable contact body can be easily moved up and down easily, so that the operation life of the switch is greatly improved and a plurality of switch circuits are easily turned on at the same time. .

According to a sixth aspect of the present invention, in the fifth aspect of the present invention, the movable portion of the movable contact body is bent in a direction away from the inner fixed contact at a connection portion at the base of the horseshoe-shaped notch. In addition, in addition to the same operation as the invention according to the fifth aspect, the gap dimension between the inner fixed contact and the movable portion of the movable contact body when the switch is turned off can be increased, and the opening and closing operation is stabilized. In addition, there is an effect that a malfunction of the switch due to vibration, impact, or the like is eliminated.

According to a seventh aspect of the present invention, in the first aspect of the present invention, the cover plate has a cap shape having a through hole in the center of the upper surface with the lower surface open, and the outer periphery of the lid plate is formed as a cap. A push button made of a rigid material that is vertically movably held on the inner periphery of the peripheral wall and whose upper central projection protrudes upward from the through hole of the lid plate is attached to the upper surface of the central top of the dome-shaped spring body in the switch case. The dome-shaped spring body can be compressed and deformed without tilting by pressing the top of the center of the dome-shaped spring body via a push button that moves up and down while being guided by the lid plate. This has the effect that a plurality of switch circuits can be turned on almost simultaneously.

According to an eighth aspect of the present invention, in the invention of the seventh aspect, the upper surface of the center top of the dome-shaped spring body and the lower surface of the push button are provided with a convex portion provided on one surface on the other surface. The contact between the lower surface of the push button and the dome when the switch is operated by pressing the push button in addition to the same operation as the invention according to claim 7, wherein the dome is engaged with the recess provided. Since there is no displacement between the upper surfaces of the central top portions of the spring bodies having the shape, the dome-shaped spring body is reliably compressed and deformed, so that the operation characteristics of the switch can be stabilized.

According to a ninth aspect of the present invention, in the invention according to the seventh or eighth aspect, at least one of the outer periphery of the lower portion of the push button or the outer periphery of the projection at the center of the upper surface is made non-circular, and the outer periphery of the non-circular lower portion is formed. The inner periphery of the peripheral wall of the cover plate and the outer periphery of the non-circular upper center protrusion are held by the hole at the center of the upper surface of the cover plate so that they can move up and down and do not rotate, and the push button rotates. The dome-shaped spring body is compressed and deformed without tilting, because it is guided so as not to rotate in the hole on the inner wall of the peripheral wall of the lid plate or the center of the upper surface when moving up and down. This has the effect that the switch circuits can be turned on more accurately and simultaneously.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. (Embodiment 1) FIG. 1 is a front sectional view of a two-circuit push-on switch according to a first embodiment of the present invention, and FIG. 2 is an exploded perspective view thereof. A switch case having an open top surface, and a pair of outer fixed contacts 12A and inner fixed contacts 12
B and outer fixed contact 13A and inner fixed contact 13B.
A pair of fixed contacts are insert-molded, and connection terminals 12C and 12D and 13C and 13D, which are electrically connected to the respective fixed contacts, project outward from the outer peripheral wall 11A and are formed into a predetermined shape, and are arranged on the outer peripheral portion. Inner fixed contacts 12B and 13B arranged at the center with respect to the outer fixed contacts 12A and 13A are lower by a predetermined size, and outer fixed contacts 12A and 13
A movable contact body 14 made of a flexible insulating substrate having a substantially circular flat plate shape is mounted on A in the same manner as in the prior art. However, as shown in FIG. A conductive paint is printed on the lower surface of a flexible insulating substrate to form two independent movable contacts 15 and 16, and fixed portions 15A and 16A disposed on the outer peripheral portion thereof are provided with the outer fixed contacts 12A. Movable parts 15B and 16B which are placed on the
Are positioned on the outer peripheral wall 11 of the switch case 11 so that the projections 14A and 14B of the substantially circular movable contact body 14 are located above the inner fixed contacts 12B and 13B.
It is positioned by being fitted into two notches 11B and 11C on the inner circumference of A.

A dome-shaped spring body 17 made of an elastic insulating material is disposed thereon, and the lower surface of the thick outer peripheral portion 17A is connected to the movable contacts 15 and 16 on the outer peripheral portion of the movable contact body 14. The lower surface of the thick central top portion 17C, which is placed on the upper rear surfaces of the fixing portions 15A and 16A and is connected by the thin conical dome portion 17B, is located above the inner fixed contacts 12B and 13B of the central portion, that is, The movable contacts 15 and 16 are disposed above the rear surfaces of the movable portions 15B and 16B at predetermined intervals, and the upper portion thereof protrudes upward as a pressing projection 17D.

Reference numeral 18 denotes a cover plate arranged so as to cover the opening on the upper surface of the switch case 11, and its peripheral wall 18A
Lower surface 18B of the outer peripheral portion 1 of the dome-shaped spring body 17
Switch case 11 so that the upper surface of 7A is pressed down.
Is fixed by caulking the dowel portion 11D on the upper surface of the outer peripheral wall 11A, whereby the fixed portions 15A and 16A of the movable contacts 15 and 16 below are securely fixed to the lower outer fixed contacts 12A and 13A, respectively. The dome-shaped spring body 17 has a pressing projection 17D at the upper portion of the center top portion 17C, which is in contact with and penetrates the center circular hole 18C so as to be able to move up and down.

The push-on switch according to the present embodiment is configured as described above, and the operation will be described next.

As shown in the front sectional view of the use state of FIG. 3, when the apparatus is mounted on the wiring board 19 of the use apparatus, the operation button 20 of the use apparatus is used to pass through the center circular hole 18C of the cover plate 18. By pressing the pressing projection 17D of the dome-shaped spring body 17 projecting upward downward,
The thin conical dome portion 17B of the spring body 17 is elastically deformed with a sense of moderation, and the lower surface of the central top portion 17C pushes the central portion of the movable contact body 14 downward to form a movable contact made of a flexible flat insulating substrate. The central portion of the body 14 is bent so as to curve downward, and the two movable contacts 1 on the lower surface thereof
The movable portions 15B and 16B of 5 and 16 are brought into contact with the inner fixed contacts 12B and 13B, respectively, and between the pair of fixed contacts 12A and 12B and 13A and 1B, respectively.
3B, that is, two sets of connection terminals 12C and 12D and 13C and 13D are connected almost simultaneously.

Thereafter, when the pressing force applied to the pressing projection 17D of the dome-shaped spring body 17 via the operation button 20 is removed, the push-on switch operates as a dome of the spring body 17 made of an elastic insulating material. The portion 17B returns to the original state shown in FIG. 1 by its elastic restoring force, and the movable contact body 14 made of a flexible insulating substrate also returns to its original flat plate shape by curving downward. Then, between the two sets of fixed contacts 12A and 12B and between 13A and 13B, that is, between the connection terminals 12C and 12D and between 13C and 13D, an open state is established again.

As is apparent from the above description, in the push-on switch according to the present embodiment, the amount of deflection of the movable contact member 14 in which the movable contacts 15 and 16 are formed by printing conductive paint on a flexible insulating substrate. The height difference between the outer fixed contacts 12A and 13A and the inner fixed contacts 12B and 13B is a contact gap when the switch is turned off. Therefore, according to the present embodiment, the structure is simple and the number of components is small. The present invention can provide a large number of two-circuit push-on switches for small currents, which are inexpensive because they do not require assembling man-hours and have small external dimensions.

(Embodiment 2) FIG. 4 is a front sectional view of a two-circuit push-on switch according to a second embodiment of the present invention, and FIG. 5 is an exploded perspective view of the same.
In contrast to the above, the material and the shape of the movable contact body 21 mounted on the outer fixed contacts 12A and 13A on the inner bottom surface of the switch case 11 are different from each other, and a dome-shaped spring body 22 mounted thereon is provided. The difference is that a push button 23 with a flange portion 23A is further mounted on a pressing surface 22C at the upper end of the central top portion 22B.

That is, as shown in FIG. 5 and FIG. 6 which is a bottom view of the movable contact body, the movable contact body 21 has two independent movable foils made of metal foil on a flexible insulating substrate 21A having a substantially circular flat plate shape. The contact points 24 and 25 are formed, and a horseshoe-shaped notch 21B is provided so as to surround the center of the contact points 24 and 25. As shown in a plan view of FIG. Then, two movable contacts 24 and 25 are formed by etching on a flexible insulating substrate 27 to which a metal foil 26 is attached, and after punching out a horseshoe-shaped notch 21B indicated by a dotted line in FIG.
The movable contact body 2 shown in FIG.
It is completed as 1.

Then, as shown in the top view of the switch case on which the movable contact body is placed as shown in FIG. 8, the fixed portions 24A and 25A of the two movable contacts 24 and 25 arranged on the outer periphery of the movable contact body 21 are formed. The movable portions 24B and 25B, which are placed on the outer fixed contacts 12A and 13A on the inner bottom surface of the switch case 11 and are arranged in the central portion surrounded by the horseshoe-shaped notch portion 21B, extend in the horizontal direction and extend to the inner fixed contacts. 1
The two projecting portions 21C and 21D on the outer periphery of the substantially circular movable contact body 21 are fitted into the two notches 11B and 11C on the inner periphery of the outer peripheral wall 11A of the switch case 11 so as to be located above 2B and 13B. The dome-shaped spring body 22 made of an elastic insulating material is disposed thereon, and the thick outer peripheral portion 22A is placed on the upper portions of the back surfaces of the fixed portions 24A and 25A of the movable contacts 24 and 25. The lower surface 18 of the peripheral wall 18A of the lid plate 18
Pressing with B is the same as in the first embodiment.

The push button 23 is made of a rigid material,
The central flat portion 23C on the lower surface of the cylindrical portion 23B is placed on the flat pressing surface 22C at the upper end of the central top portion 22B of the dome-shaped spring body 22 made of an elastic insulating material.
Plate 1 whose upper part closes the upper opening of switch case 11
A portion that penetrates through a circular hole 18C at the center of the hole 8C with a small gap and protrudes upward forms a pressing protrusion 23D, and a circular flange portion 23A at the lower end of the columnar portion 23B is formed on the back surface of the cover plate 18. , And serves as a retaining portion for the push button 23 to move upward.
A is fitted and held on the inner periphery of A with a small gap.

The push-on switch according to the present embodiment is constructed as described above. The operation of the push-on switch is mounted on the wiring board 19 of the equipment to be used as shown in the front sectional view of the use state in FIG. When the upper surface of the pressing projection 23D of the push button 23 is pressed downward through the operation button 20 of the device in use, the center top 22B of the dome-shaped spring 22 in contact with the flat plate portion 23C on the lower surface of the device. Is pressed downward, the thin conical dome portion 22D is elastically deformed with a sense of moderation, and the lower surface of the central apex 22B is formed in the horseshoe-shaped notch 21B at the center of the movable contact body 21. Pushing the enclosed portion, it is slightly bent downward from the horizontal direction, and the two movable contacts 24 and 2 on the lower surface thereof
5 movable portions 24B and 25B are brought into contact with the inner fixed contacts 12B and 13B, respectively, and between the paired fixed contacts 12A and 12B and between 13A and 13B, that is, between two pairs of connection terminals 12C and 12D and 13
C and 13D are connected almost simultaneously.

Then, the operation button 20 and the push button 2
When the pressing force applied to the dome-shaped spring body 22 through 3 is removed, the spring body 22 made of an elastic insulating material returns to the original state shown in FIG. The portion surrounded by the horseshoe-shaped notch 21B at the center of the movable contact body 21 returns to the original horizontal state by its elastic restoring force, and the two fixed contacts 12
The open state between A and 12B and between 13A and 13B, that is, between the connection terminals 12C and 12D and between 13C and 13D is the same as in the first embodiment.

Here, when the push button 23 pressed by the operation button 20 of the device to be used is lowered, the outer periphery of the cylindrical portion 23B is guided by the circular hole 18C at the center of the cover plate 18, and Since the outer periphery of the flange portion 23A also moves downward while being guided by the inner periphery of the peripheral wall 18A of the cover plate 18, the push button 23 descends almost vertically without tilting, and is pushed by the flat plate portion 23C on the lower surface of the cylindrical portion 23B. Since the pressing surface 22C at the upper end of the center top 22B of the dome-shaped spring body 22 is also pushed substantially vertically downward, it is surrounded by the horseshoe-shaped notch 21B at the center of the movable contact body 21 pressed on the lower surface of the center top 22B. The movable portions 24B and 25B of the two movable contacts 24 and 25 on the lower surface of the portion are formed by two sets of fixed contacts 12A and 1B.
2B and 13A and 13B can be simultaneously connected more accurately than in the first embodiment to turn on two sets of switch circuits.

In the push-on switch according to the present embodiment, the center of the movable contact body 21 having the movable portions 24B and 25B of the two movable contacts 24 and 25 is surrounded by a horseshoe-shaped notch 21B. The movable part 2 can be easily moved up and down simply by being connected to the surrounding substantially flat plate-shaped insulating substrate 21A by the thin connecting part 21E.
4B and 25B, ie the outer fixed contact 12
The contact gap when the switch is OFF, which is the height difference between A and 13A and the inner fixed contacts 12B and 13B, can be made larger than in the case of Embodiment 1. On the other hand, the movable contact of the movable contact body 21 Since the metal foils 24 and 25 are formed from the metal foil 26, the capacity of the switch can be considerably increased and the operating life of the switch can be extended.

FIG. 10 is a front sectional view showing a configuration for further stabilizing the operation characteristics of the two-circuit push-on switch according to the present embodiment, which is the same as that described with reference to FIGS. On the other hand, a central top portion 28A of the dome-shaped spring body 28 and a flange portion 29A mounted thereon are provided.
A circular convex portion 28C is formed at the center of the pressing surface 28B of the spring body 28, and a circular concave portion 29C is formed at the center of the flat plate portion 29B on the lower surface of the push button 29.
Are different from each other in that the convex portion 28C and the concave portion 29C are engaged with each other.

The engagement of the convex portion 28C and the concave portion 29C allows the pressing protrusion 2 of the push button 29 to be pressed.
9D is pressed to push the pressing surface 28B at the upper end of the central top portion 28A of the spring body 28 to elastically deform the dome portion 28D to perform a switch operation.
9B and the pressing surface 28B of the spring body 28 are not displaced, so that when the push button 29 is lowered vertically, the central top portion 28A of the spring body 28 is also pressed vertically downward and pressed by its lower end surface 28E. The movable portions 24B and 25B of the two movable contacts 24 and 25 on the lower surface of the portion surrounded by the horseshoe-shaped notch 21B at the center of the movable contact body 21 reliably contact the inner fixed contacts 12B and 13B, respectively. The two sets of fixed contacts 12A and 12B and 13A and 13B can be stably connected almost simultaneously.

(Embodiment 3) FIG. 11 is a front sectional view of a two-circuit push-on switch according to a third embodiment of the present invention, and FIG. 12 is an exploded perspective view of the same according to the second embodiment. The material of the movable contact body 30 placed on the outer fixed contacts 12A and 13A on the inner bottom surface of the switch case 11 is different from that of the movable contact body 30, and the dome-shaped spring body 22 mounted on the movable contact body 30 is mounted thereon. The shape of the push button 31 placed on the pressing surface 22C at the upper end of the central top 22B and the shape of the lid plate 32 holding the push button 31 are different.

That is, the shape of the movable contact body 30 is the same as that of the second embodiment, and the movable contacts 33 and 3
4, a horseshoe-shaped notch 30B is provided so as to surround the center portion of the substantially circular flat elastic metal thin plate having the shape 4.
The central portion of the movable contacts 33 and 34 having the movable portions 33B and 34B is bent upward at the connecting portion 30C at the base of the notch 30B on the horseshoe shape.

As shown in the plan view of FIG. 13 for explaining the method of forming the movable contact member, the elastic metal sheet 3 is formed.
5 on the insulating film 3 by a method such as painting or laminating.
6 is formed, and a conductive paint is printed thereon to form two independent movable contacts 33 and 34. Then, a horseshoe-shaped notch 30B shown by a dotted line in FIG.
The center part is a horseshoe-shaped notch part 30B and a connection part 30 at the base.
C, the movable contacts 33 and 34 are bent so that the surface on which the movable contacts 33 and 34 are formed is outside, and then punched into a substantially circular outer shape to complete the movable contact body 30.

The fixed portions 33A and 34A of the two movable contacts 33 and 34 of the movable contact body 30 are fixed to the outer fixed contacts 12A and 13A on the inner bottom surface of the switch case 11.
And the two movable parts 33B and 34B disposed in the center part surrounded by the horseshoe-shaped notch part 30B and bent by the connection part 30C at the base thereof are slightly apart from the inner fixed contacts 12B and 13B. Positioning is performed by fitting two projecting portions 30D, 30E on the outer periphery of the substantially circular movable contact body 30 into two notches 11B, 11C on the inner periphery of the outer peripheral wall 11A of the switch case 11 so as to be positioned. A dome-shaped spring body 22 made of an elastic insulating material is disposed thereon, and its thick outer peripheral portion 22A is placed on the upper rear surfaces of the fixed portions 33A and 34A of the movable contacts 33 and 34, and the cover plate 32 Lower surface 32 of peripheral wall 32A
Pressing with B is the same as in the second embodiment.

The push button 31 is shown in FIGS.
As shown in FIG. 2, there are two first projecting portions 31C having a fixed width from the upper end of the columnar portion 31A at the center of the upper surface to the position of the flange portion 31B at the lower end, and the first projecting portion is provided on the outer periphery of the flange portion 31B. The portion 31C has second projecting portions 31D at two positions perpendicular to the direction.

On the upper surface of the lid plate 32 holding the push button 31, the columnar portion 31A and the first projecting portion 31C at the center of the upper surface of the push button 31 are fitted and held so that they can move up and down and do not rotate. As shown in FIG. 14, a non-circular hole 32C having two circular cuts is provided, and a lid is formed as shown by a dotted line in FIG. 14, which is a top view of the push-on switch according to the present embodiment. Peripheral wall 32A of plate 32
Are provided with four circular cuts on the inner circumference of the push button 31 so that the flange portion 31B of the push button 31, the first protrusion 31C, and the second protrusion 31D can be vertically moved and fitted so as not to rotate. A non-circular depression 32D is provided.

The push-on switch according to the present embodiment is configured as described above.
By using an elastic metal thin plate 35 on which an insulating film 36 is formed as a substrate, it is possible to expect a longer switch life due to the elasticity of the elastic metal thin plate 35,
By bending the portions of the movable contacts 33 and 34 at the central portion of the movable contact body 30 where the movable portions 33B and 34B are formed in a direction away from the inner fixed contacts 12B and 13B, the inner fixed contacts 12B and 13B when the switch is OFF are movable. The size of the gap between the portions 33B and 34B can be increased, so that the opening / closing operation is stabilized, and the malfunction of the switch due to vibration, impact, or the like is eliminated.

During the operation, when the push button 31 is pushed down by the pushing protrusion 31E at the upper end of the push button 31, the columnar portion 31A and the first projecting portion 31
C is guided by the non-circular hole 32C at the center of the upper surface of the lid plate 32 so as not to rotate, and the flange portion 31B, the first projecting portion 31C, and the second projecting portion 31D are also formed on the inner periphery of the peripheral wall 32A of the lid plate 32. The push button 31 descends vertically with almost no inclination to be guided downward so as not to rotate by the circular recess 32D, and the flat portion 31 on the lower surface of the columnar portion 31A.
A central top portion 22B of the dome-shaped spring body 22 pushed by F
The pressing surface 22C at the upper end is also pressed substantially vertically downward, so that the thin conical dome portion 22D is elastically deformed with a sense of moderation, and the lower surface of the central apex 22B is moved downward by the movable contact body 30.
The center portion, which is surrounded by a horseshoe-shaped notch portion 30B at the center and bent upward at the connection portion 30C at the root, is pressed downward, and the two movable contacts 33 and 34 on the lower surface thereof are two sets of fixed contacts 12A and 12B. And 13A and 13B can be connected more accurately at the same time, and the two sets of switch circuits can be turned on almost simultaneously.

Further, also in the push-on switch according to the present embodiment, as described in the second embodiment, the pressing surface 2 at the upper end of the central top 22B of the dome-shaped spring body 22
2C and the columnar portion 31 of the push button 31 placed thereon
It is a matter of course that a more stable operation can be achieved by providing a convex portion or a concave portion on the flat plate portion 31F on the lower surface of A and engaging the convex portion and the concave portion.

In the first to third embodiments, the case where the number of circuits of the push-on switch is two has been described as an example, but the number of the fixed contacts and the number of the corresponding movable contacts are all described. Needless to say, by increasing the number of switches, a push-on switch having a larger number of circuits can be realized.

[0044]

As described above, according to the present invention, a push-on having a plurality of circuits which is inexpensive because of a simple structure, has few components, and does not require assembling man-hours, and has a small external dimension and excellent electrical characteristics. The advantageous effect that a switch can be provided is obtained.

[Brief description of the drawings]

FIG. 1 is a front sectional view of a two-circuit push-on switch according to a first embodiment of the present invention.

FIG. 2 is an exploded perspective view of the same.

FIG. 3 is a front sectional view of the same use state.

FIG. 4 is a front sectional view of a two-circuit push-on switch according to a second embodiment of the present invention.

FIG. 5 is an exploded perspective view of the same.

FIG. 6 is a bottom view of the movable contact body, which is the main part.

FIG. 7 is a plan view illustrating a method of forming the movable contact body.

FIG. 8 is a top view of a switch case on which a movable contact body as the main part is mounted.

FIG. 9 is a front sectional view of the same use state.

FIG. 10 is a front sectional view showing a configuration for further stabilizing the operation characteristics.

FIG. 11 is a front sectional view of a two-circuit push-on switch according to a third embodiment of the present invention.

FIG. 12 is an exploded perspective view of the same.

FIG. 13 is a plan view for explaining a method of forming a movable contact body, which is the main part.

FIG. 14 is a top view of the same.

FIG. 15 is a front sectional view of a conventional push-on switch.

FIG. 16 is an exploded perspective view of the same.

[Explanation of symbols]

Reference Signs List 11 Switch case 11A Outer peripheral wall 11B, 11C Notch 11D Dowel 12A, 13A Outer fixed contact 12B, 13B Inner fixed contact 12C, 12D, 13C, 13D Connection terminal 14, 21, 30 Movable contact 14A, 14B Projection 15 , 16, 24, 25, 33, 34 Movable contacts 15A, 16A, 24A, 25A, 33A, 34A Fixed portions 15B, 16B, 24B, 25B, 33B, 34B Movable portions 17, 22, 28 Spring bodies 17A, 22A Outer peripheral portion 17B, 22D, 28D Dome 17C, 22B, 28A Central top 17D, 23D, 29D, 31E Pressing projection 18, 32 Cover plate 18A, 32A Peripheral wall 18B, 32B Lower surface 18C Circular hole 19 Wiring board 20 Operation button 21A, 27 Insulating substrate 21B, 30B Notch 21C, 2 D, 30D, 30E Projecting part 21E, 30C Connecting part 22C, 28B Pressing surface 23, 29, 31 Push button 23A, 29A, 31B Flange part 23B, 31A Columnar part 23C, 29B, 31F Flat part 26 Metal foil 28C Convex part 28E Lower end surface 29C Concave portion 31C First protruding portion 31D Second protruding portion 32C Non-circular hole 32D Non-circular recess 35 Elastic metal sheet 36 Insulation coating

Claims (9)

[Claims] A plurality of pairs of outer fixed contacts and inner fixed contacts lower by a predetermined dimension than the pair are insert-molded so as to be exposed on the inner bottom surface, and connection terminals electrically connected to the respective fixed contacts are formed on the outer side. A plurality of movable contacts consisting of a fixed part placed on each of the plurality of sets of outer fixed contacts and a movable part extending from above to each of the inner fixed contacts, and an upper surface open switch case made of an insulating resin derived from A movable contact body formed by a thin conductive layer on the lower surface of a flexible insulating substrate, and a thicker outer peripheral lower surface is placed on a plurality of fixed portions of the movable contact body, and the center of the thick wall is connected by a thin conical portion. A dome-shaped spring body made of an elastic insulating material having a lower surface of a top located above a plurality of movable parts of the movable contact body, and an upper part of a central top serving as a pressing projection; and an opening of a switch case. And close the outer periphery A hole is fixed to the upper part of the outer periphery of the switch case so that the surface presses against the upper surface of the outer peripheral part of the dome-shaped spring body. Push-on switch consisting of a cover plate. 2. The push-on switch according to claim 1, wherein the thin conductive layer forming the movable contact of the movable contact body made of a flexible insulating substrate is formed by printing a conductive paint. 3. The push-on switch according to claim 1, wherein the thin conductor layer forming the movable contact of the movable contact body made of a flexible insulating substrate is formed by attaching a metal foil and then performing an etching process. . 4. The push-on switch according to claim 1, wherein said movable contact body is formed by forming a plurality of movable contacts by printing an electrically conductive paint on an insulating film formed on an elastic metal thin plate. 5. The push-on switch according to claim 1, wherein the movable contact body is provided with a horseshoe-shaped notch so as to surround the movable contact centering above the inner fixed contact. . 6. The push-on switch according to claim 5, wherein the movable contact of the movable contact body is bent at a connection portion at the base of the horseshoe-shaped notch portion in a direction away from the inner fixed contact. 7. A cover plate having a cap shape having a through hole in the center of the upper surface with the lower surface open, the outer periphery of which is vertically movably held by the inner periphery of the peripheral wall of the cover plate, and a projection at the center of the upper surface is a through hole in the lid plate. The push-on switch according to any one of claims 1 to 6, wherein a push button made of a rigid material protruding upward from the upper surface is mounted on an upper surface of a central top of a dome-shaped spring body in the switch case. 8. The upper surface of the center top of the dome-shaped spring body and the lower surface of the push button are brought into contact with each other in a state where the convex portion provided on one surface is engaged with the concave portion provided on the other surface. The push-on switch according to claim 7. 9. At least one of the outer periphery of the lower part of the push button or the outer periphery of the projection at the center of the upper surface is made non-circular, the outer periphery of the non-circular lower part is the inner periphery of the peripheral wall of the cover plate, and the protrusion at the center of the non-circular upper surface is formed. 9. The push-on switch according to claim 7, wherein the outer periphery of the portion is held by a hole in the center of the upper surface of the lid plate so that both can move up and down and do not rotate.